For horizontal sections where cable trays are laid out in a straight line, the typical support span (distance between supports) should range from 1. This range allows for easy access and efficient maintenance. The cable manufacturer's recommended minimum bending radii for the specific. maintain spacing or to keep cables in place when the tray is ect the minimum bend ra-dius for cables as they exit the bottom of the cable tray. All illustrations, descriptions and technical information included in this document are provided as indications and can cable trays are equivalent. The mechanical and electrical characteristics, tests, certifications, overall quality management, recommendations mentioned. Although BS 7671 touches on the subject of cable supports, it does not detail specifically what these support distances should be.